The Big Bang Theory

The Fortification Implementation

Aired Apr 9, 2015 · 8:00 PM ET · 25 min

When Sheldon and Amy build a blanket fort, they come to major crossroads in their relationship. Also, Wolowitz meets the half-brother he never knew he had, and when Penny is invited to appear on Wil Wheaton’s podcast, she and Leonard have a huge, on-air argument.